<div class="btn-group header-list" uib-dropdown>
  <button class="btn btn-default dropdown-toggle" title="标题" uib-dropdown-toggle>
    <i class="fa fa-header"></i>
    <span class="caret"></span>
  </button>
  <ul class="dropdown-menu" ng-class="{'dropdown-menu-right': position == 'right'}" uib-dropdown-menu>
    <li ng-repeat="level in ['一', '二', '三', '四', '五', '六']"><a href="javascript:void(0)"
        ng-click="select($index+1)"><span class="h{{$index+1}}">{{level}}级标题</span></a></li>
  </ul>
</div>
